///*
// * Copyright 2002-2023 the original author or authors.
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *      https://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//
//package org.springframework.http.codec;
//
//import kotlinx.serialization.KSerializer;
//import kotlinx.serialization.SerialFormat;
//import kotlinx.serialization.SerializersKt;
//import kotlinx.serialization.descriptors.PolymorphicKind;
//import kotlinx.serialization.descriptors.SerialDescriptor;
//import org.springframework.core.ResolvableType;
//import org.springframework.lang.Nullable;
//import org.springframework.util.ConcurrentReferenceHashMap;
//import org.springframework.util.MimeType;
//
//import java.lang.reflect.Type;
//import java.util.*;
//
///**
// * Base class providing support methods for encoding and decoding with Kotlin
// * serialization.
// *
// * @author Sebastien Deleuze
// * @author Iain Henderson
// * @author Arjen Poutsma
// * @since 6.0
// * @param <T> the type of {@link SerialFormat}
// */
//public abstract class KotlinSerializationSupport<T extends SerialFormat> {
//
//	private final Map<Type, KSerializer<Object>> serializerCache = new ConcurrentReferenceHashMap<>();
//
//	private final T format;
//
//	private final List<MimeType> supportedMimeTypes;
//
//	/**
//	 * Creates a new instance of this support class with the given format
//	 * and supported mime types.
//	 */
//	protected KotlinSerializationSupport(T format, MimeType... supportedMimeTypes) {
//		this.format = format;
//		this.supportedMimeTypes = Arrays.asList(supportedMimeTypes);
//	}
//
//	/**
//	 * Returns the format.
//	 */
//	protected final T format() {
//		return this.format;
//	}
//
//	/**
//	 * Returns the supported mime types.
//	 */
//	protected final List<MimeType> supportedMimeTypes() {
//		return this.supportedMimeTypes;
//	}
//
//	/**
//	 * Indicates whether the given type can be serialized using Kotlin
//	 * serialization.
//	 * @param type the type to be serialized
//	 * @param mimeType the mimetype to use (can be {@code null})
//	 * @return {@code true} if {@code type} can be serialized; false otherwise
//	 */
//	protected final boolean canSerialize(ResolvableType type, @Nullable MimeType mimeType) {
//		KSerializer<Object> serializer = serializer(type);
//		if (serializer == null) {
//			return false;
//		}
//		else {
//			return (supports(mimeType) && !String.class.isAssignableFrom(type.toClass()) &&
//					!ServerSentEvent.class.isAssignableFrom(type.toClass()));
//		}
//
//	}
//
//	private boolean supports(@Nullable MimeType mimeType) {
//		if (mimeType == null) {
//			return true;
//		}
//		for (MimeType candidate : this.supportedMimeTypes) {
//			if (candidate.isCompatibleWith(mimeType)) {
//				return true;
//			}
//		}
//		return false;
//	}
//
//
//	/**
//	 * Returns the serializer that can (de)serialize instances of the given
//	 * type. If no serializer can be found, or if {@code resolvableType} is
//	 * a <a href="https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism">open polymorphic</a>
//	 * type, {@code null} is returned.
//	 * @param resolvableType the type to find a serializer for
//	 * @return a resolved serializer for the given type, or {@code null}
//	 */
//	@Nullable
//	protected final KSerializer<Object> serializer(ResolvableType resolvableType) {
//		Type type = resolvableType.getType();
//		KSerializer<Object> serializer = this.serializerCache.get(type);
//		if (serializer == null) {
//			try {
//				serializer = SerializersKt.serializerOrNull(this.format.getSerializersModule(), type);
//			}
//			catch (IllegalArgumentException ignored) {
//			}
//			if (serializer != null) {
//				if (hasPolymorphism(serializer.getDescriptor(), new HashSet<>())) {
//					return null;
//				}
//				this.serializerCache.put(type, serializer);
//			}
//		}
//		return serializer;
//	}
//
//	private static boolean hasPolymorphism(SerialDescriptor descriptor, Set<String> alreadyProcessed) {
//		alreadyProcessed.add(descriptor.getSerialName());
//		if (descriptor.getKind().equals(PolymorphicKind.OPEN.INSTANCE)) {
//			return true;
//		}
//		for (int i = 0 ; i < descriptor.getElementsCount() ; i++) {
//			SerialDescriptor elementDescriptor = descriptor.getElementDescriptor(i);
//			if (!alreadyProcessed.contains(elementDescriptor.getSerialName()) && hasPolymorphism(elementDescriptor, alreadyProcessed)) {
//				return true;
//			}
//		}
//		return false;
//	}
//
//}
